Andrew l



(No Model.)

A. L RIKER. LAMINATED FIELD MAGNET FRAME FOR DYNAMO ELEOTRIU MACHINES.No. 507,690. Patented Oct. 31,1893.

UNITED STATES PATENT OFFICE.

ANDREW L. BIKER, OF NEW YORK, N. Y.

LAMINATED FIELD-MAGNET FRAME FOR DYNAMO-ELECTRIC MACHlNES.

SPECIFICATION forming part of Letters Patent No. 507,690, dated October31,1893.

Application filed July 27, 1893. Serial No. AS1605. (No model.)

To all whom it may concern.-

Be it known that 1, ANDREW L. BIKER, of New York city, New York, haveinvented a new and useful Improvement in Laminated Field-Magnet Frames,which is fully set forth in the following specification.

This invention has reference to the construction of laminatedfield-magnet frames for dynamo-electric machines or electro-motors.

In Letters-Patent Nos. 452,717, and 452,718, granted to me May 19, 1891,I have described the construction of several types of laminated framesbuilt of blanks or stampings of wrought iron, assembled together in suchmanner as to constitute a solid structure, yet capable of being readilytaken to pieces for removal and replacement of coils or'windings. Thepresent invention is similar in principle to those described in saidprior patents, and its special object is to produce a laminated built upframe having an open, instead of a closed magnetic circuit, and havingthe armature space at one end or side of the frame instead of in thecenter thereof.

In carrying out the present invention I employ three blanks or elements,two constituting pole-portions and the other the core-portion, and allthree constituting when laid together without overlapping, a completelamina of the shape of the complete frame. The pole-piece blanks are ofdifferent shapes, one being abutted against the side of the coreblank,and the other against its end and in that position making a symmetricalfigure, so that alternate lamina'or groups of laminae can be reversed inthe manner described in the patents above referred to making tongue andgroove joints at the extremities of the core, between it and thepole-pieces.

The invention is illustrated in the accompanying drawings.

Figure I is an outline view or front elevation of a magnet frameconstructed in accordance with the invention, and Fig. II a side ele-Vation.

The frame is composed of three distinct stampings. A is the blank forthe core section, and B, C the blanks for the pole-sections.

The shape of these blanks is so clearly shown as to require nodescription. Blank A has one end squared, and against this end is placedthe curved end of blank 0 which is longer than blank B by the width ofthe blank A. Blank B is disposed against the side of blank A, and whenso disposed the three blanks form a symmetrical figure.

Blanks B C have at one end pole-pieces D curved in a circular arc toconform to the periphery of the armature. In building up the framealternate layers or groups of layers are reversed so as to form at thejoints tongues and recesses, as indicated in Fig. II through whichholding bolts E are inserted. The position of the joints in the nextlamina or group are indicated in Fig. I by dotted lines.

The shape of the frame is such that it may be set in several positionsaccording to the use desired. For propelling boats it is disposed as inFig. I with the pole portions downward, the curved sides being adaptedto fit conveniently in the bottom of the boat and bring the armatureshaft in' suitable elevation to the propeller.

For driving fans, or for any purpose which requires room to clear theground or floor, the frame is inverted, resting on the part A as a base,and for other purposes the machine can rest upon one of the sides B or0.

Having now particularly described my invention, what I claim as new is Afield magnet frame for dynamos or electro-motors composed of threeblanks or stampings of wrought iron constituting, when laid together asspecified without overlapping, a symmetrical figure with the coreportion at one end and the pole-pieces at the other, adjacent layers orgroups being reversed so as to constitute tongue and groove joints,substantially as described.

In testimony whereof I have signed this specification in the presence oftwo subscribing witnesses.

ANDREW L. BIKER.

Witnesses:

CORNELIUS J. JORDAN, WM. W. RICHARD.

